Hi Aussie, I think Dahlek hit the nail on the head by saying depends on how aggresive the massage is, a very gentle smoothing massage that feels great should do you more good than harm, because it does the same thing as magnetic therapy does, it increases blood circulation which brings oxygen & purities thats in the blood to the injured area.
I would take notice of Wings about adding 2 parts Calcium to one part Magnesium.
take care
Brian